Geometrical OpticsHard
Question
A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If a 50 m tall
tower at a distance of 1 km is observed through this telescope in normal setting, the angle formed by the
image of the tower is θ, then θ is close to :
tower at a distance of 1 km is observed through this telescope in normal setting, the angle formed by the
image of the tower is θ, then θ is close to :
Options
A.15o
B.60o
C.30o
D.1o
Solution
MP = 
= 30
θ0 =
red
θ = MP × θ0
= 30
=
= 1.5 rad
= 1.5 ×
= 86o
= 30θ0 =
redθ = MP × θ0
= 30
=
= 1.5 rad= 1.5 ×
= 86oCreate a free account to view solution
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